#include<stdio.h>
#include<math.h>
int main()
{
    int n,i,j,k;
    printf("please enter a integer number:n=?\n");
    scanf("%d",&n);
    k=sqrt(n);
    for(i=2;i<=k;i++)
    if(n%i==0)break;
    if(i<k)printf("%d is not prime number\n",n);
    else printf("%d is prime number\n",n);
    return 0;



}